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Compaq Smart Array 3200 Controller Reference Guide
Writer: Rickard Project: Compaq Smart Array 3200 Controller Reference Guide Comments: 340862-002
File Name: L-APPE.DOC Last Saved On: 12/7/98 9:30 AM
COMPAQ CONFIDENTIAL - NEED TO KNOW REQUIRED
Controller Duplexing
Some operating systems support controller duplexing, a fault-tolerance feature
that requires two Smart Array 3200 Controllers. With duplexing, the two
controllers each have their own drives that contain identical data. In the unlikely
event of a Smart Array 3200 Controller failure, the remaining drives and the
Smart Array 3200 Controller service all requests.
Controller duplexing is not the same as duplexing the SCSI buses on a single
Smart Array 3200 Controller. Controller duplexing is a function of the operating
system and takes the place of other fault-tolerance methods. Refer to the
documentation included with your operating system for implementation.
Compaq recommends using hardware-based fault tolerance instead of controller
duplexing. Hardware-based fault tolerance provides a much more robust and
controlled environment for fault-tolerance protection.
If you choose controller duplexing, configure each Smart Array 3200 Controller
with RAID 0 to achieve maximum storage capacity. In addition, the following
fault-tolerant features will not be available: online spare, auto-reliability
monitoring, interim data recovery, and automatic data recovery.